Prop for mines



man 3,1925." 1,528,634

P. THIELMANN v Pao? Foa MINES :Q irllgd Feb. i6. A1924 Patented Mar. 3, 1925. y

UNITED sTArEs PA'rErrr OFFICE.

PETER THIELMANN, F SLSGHEDE, GERMANY, ASSIGNOR 0F ONE-'HALF TO THE FIRM GoswIN u. o0., KOMM. GEsnLLscHAFT',

Peor vnon MINEs.

Application filed February To all whom t may concern.' Be it known that I, PIETER THIELtIANN, a

citizen of the German Republic, residing l at Silschede, Germany, have invented certain new and useful Improvements in and Relating to Props for Mines V(for which I have filed application in Germany, April 6, 1921), of which the following is a speciication. Y

This invention relatestoan improvement of the commonly used props for mines which have a cap partly filled with gobbing and designed to intercept the pressure of the ground transmitted to the stay by the cross-quarter bearing on the cap. When the pressure occurs the filling material in the cap is compressed and squeezed out of the holes provided in the cap. It is rather difficult to compensate the irregular height differences which are unavoidable with such caps. This invention avoids this inconvenience by providing means which allow to easily compensate the difference of height, these means being adapted to be removed together with the props.

According to the invention the cap, mounted on the prop is of semi-spherical shape in its top part. On the side of the semi-spherical head part of the cap strutting 3o irons are arranged the inner surfaces of which adapt themselves to the curved outer surfaces of the cap. The upper ends of the strutting irons which supportthe crossquarter are connected with one another in' such a manner that the distance between the two irons can be adjusted. The strutting irons are adapted to slide up on the curved part of the cap and to adjust themselves Vin accordance with the varying interval between the cap and the cross-quarter.

The invention will be best understood from a consideration of the following detailed description taken in connection with the accompanying` drawings forming a part of this specification, with the understanding that while on the drawings one embodiment of the invention is disclosed, the invention is not conined to any strict conformity with the showing of the drawings, but may be embodied in any manner which does not make a material departure from the salient features of the invention.

In the drawing Fig. 1 shows a part of a gallery roof supported by props.

0F HASPE IN VVESTPHALIA, GERMANY.

16, 1924. Serial Nc. 693,298. l

Fig. 2 shows in section a prop head.

. F 3 is a side elevation of Fig. 2.

Fig. 4f shows in plan view a strutting iron seen from the inside.

The roof a of the mining gallery is stayed by cross-quarters o and longitudinal quarters c and the quarters c are stayed by props d. These props 'd have iron caps c with holes The hollow caps e are filled with` gobbing g.v When a pressure is exerted on the cap from above the gobbing is squeezed out through the holes f. Nails it nailed through longitudinal slots g in the lower part of the cap serve to indicate how much the cap has yielded under the pressure and to which extent the filling has been compressed or squeezed out.

According to thefinvention the top part of this cap e is of semi-spherical or other round shape, strutting irons being mounted on either side of the cap designed to carry the quarters c and to hold the same at a certain distance from the cap e. The strutting irons are composed of the upper bearing arms a for the quarter c, the middle straight part o and the lower butt strap p having a concave inner surface which lits the curvature of the vcap and an end piece g with a longitudinalslitr. To increase the stability the strutting iron is reinforced by ribs s. From the cap e an arm Zr: projects at either side andv has a cross arm m arranged so that it stands transversely to the vertical longitudinal slot 9^ of the strutting iron.

To put the strutting irons in place they are turned for 900 so that the slot 1* can be pushed over the cross arm m, whereupon the strutting iron is turned back so that the cross arm mi of the pin c stands at right angles of the slot r and securely holds the strutting iron on thel cap. The straight part 0 of the strutting irons are connected with one another by a bolt a which projects through slots t ofthe middle parts and has a head o at one end and is threaded at the other end on which a nut w is screwed. Accord ing to the interval between the quarter c and the upper part of the cap the strutting irons are adjusted on the curvature of the cap, the longitudinal slots r moving on the pins k. rIf the pressure of the ground becomes too great the strutting irons can be spread farther apart after the nut fw has been loosened. The interval between the quarter c llO.

and the prop head is thus reduced whereloy the pressure of the ground is compensated. is the strutting irons are securely attached on the cap by the pins 7c they are removed with the props so that they cannot get lost and are disposal when the props are to he used again.

I claiinz- Y l. A prop for mines with a cap partly illed with golohing comprising in combination a cap having a semi-spherical top part and strutting irons one on each side of the cap having concave bearinff'surfaces adapted to slide on"the curved outersurface of the topv part oftheA cap7 means for' connecting the two struttingV irons' with one another, and means lier attaching the strutting irons securely but adjustably with the cap. Y Y

2; A prop for mines with a cap partly ille'd with golololing comprising'in'co1nhina` tion a cap having a semi-spherical top part and strutting irons one on each side of the cap having concave hearing surfaces adapted to slide on the curved outer surface of the top part of the cap and vertical slits in the lower parts, means for connecting the two strutting irons with one another, two pins one for each strutting iron fixed in and laterally projecting from said cap, and a cross arm of each pin for attaching the strutting arms securely but adjustahly with the cap.

In testimony whereofl my signature in presence of two witnesses.

, Y PETER THIELMANN. Witnesses:

WLAD. ENDER,

ROGERS. AUGSACH.v 

